Question

U2JWho discovered x-rays ?
Q3)Compute ratio of 1AU and 1 ly approximately ?
Q4)Who has propounded the theory of dual nature of radi​

Answer 1

Explanation:

Wilhelm Roentgen

Wilhelm Roentgen, Professor of Physics in Wurzburg, Bavaria, discovered X-rays in 1895—accidentally—while testing whether cathode rays could pass through glass.

Answer 2

Answer:

Ans 2.Wilhelm Roentgen

Wilhelm Roentgen, Professor of Physics in Wurzburg, Bavaria, discovered X-rays in 1895—accidentally—while testing whether cathode rays could pass through glass.

Ans 3.The speed of lights is c ≈ 300,000 km / sec (3*10^5). So one light year ≈ 3 * 10^5 * 3.15 * 10^7 = 9.45 * 10^12 km. An Astronomical Unit is the radius of Earth's orbit about the Sun (the mean distance of the Earth from the Sun) ≈ 150 million km (1.5 * 10^8). Answer: close to 63,000.

Ans 4. sorry don't know